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Investments in Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Fees earned for property and asset management, construction, development, and other services to joint ventures $ 1,500 $ 1,800  
Assets 7,104,033   $ 7,198,952
Liabilities 3,629,957   3,682,365
Equity 3,405,977   3,444,905
Net income 32,473 44,467  
Income (Loss) from Equity Method Investments 1,914 [1] 2,122  
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Schedule of Equity Method Investments [Line Items]      
Assets 682,400   691,500
Liabilities 512,500   509,100
Equity 148,400   $ 149,100
Revenues 33,000 32,300  
Net income $ 3,800 $ 4,500  
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.